Frameworks on JAVAPRO International

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Tue, 30 Jun 2026 08:50:00 +0000

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Download free PDF here: Edition 06/2026 | Autonomous Java

06-2026 | Autonomous Java

Tue, 30 Jun 2026 07:00:02 +0000

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CORE JAVA
▪️Learning Java Automation the SOLID Way: A Beginner’s Guide to Learn Page Object Model with Java SOLID Principles
▪️OpenJ9 GC Policies: How to Choose the Right Collector

API & FRAMEWORKS
▪️Elasticsearch Java SDK: No Magic, Just Solid Design Choices
▪️Java Developers, You’re Already Ready for Blockchain — You Just Don’t Know It Yet
▪️Connecting Java Reinforcement Learning to Python Gymnasium
▪️Beyond Text Search: A Smarter Way to Understand Your Code
▪️The 3 A.M. Deadlock

JCON EUROPE 2026: Why the Java Community Still Meets in Person

Mon, 01 Jun 2026 07:00:00 +0000

Every year, when we start planning JCON EUROPE, one question always guides us:

How do we create a conference that developers genuinely enjoy attending?

Not just another event with slides and sponsor booths. Not a place where people passively consume information and leave. We wanted to create an environment where developers actively connect, discuss, challenge ideas, and solve real-world problems together.

Looking back at JCON EUROPE 2026, I believe this spirit was visible everywhere.

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Thu, 28 May 2026 12:00:00 +0000

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‘From AI as a Feature to AI as Infrastructure’ – download free PDF here!

05-2026 | From AI as a Feature to AI as Infrastructure

Thu, 28 May 2026 10:41:04 +0000

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JCON
▪️JCON Europe 2026: Why the Java Community Still Meets in Person

CORE JAVA
▪️Java 26 Is Boring
▪️Structured Concurrency in Java 26 (JEP 525 Deep Dive)
▪️Are the Classic Design Patterns Still Valid with Modern Java?

API & FRAMEWORKS
▪️The Gen AI Iceberg – Java Tooling Edition
▪️Building AI-Driven Java Systems with Spring AI and Java 26
▪️LangChain4j Agentic Workflows: From AI Calls to Multi-Agent Systems in Java

OpenFeature - one flag to rule them all!

Thu, 14 May 2026 07:00:01 +0000

Feature flags and where to find them

What are feature flags?

To keep it simple it’s a way to change the system behaviour at runtime without hassle.

Note: And if this “refresher” was the only theoretical thing you wanted to know or if you already use feature flags and want to jump straight to code/ OpenFeature demo, feel free to do so; otherwise, please bear with me for another couple of text pages.

Stop Writing YAML: How to Define, Test, and Deploy Your Cloud in Pure Java

Tue, 12 May 2026 07:00:00 +0000

1. Introduction

As Java developers, we apply rigorous engineering practices to application code: type safety, unit testing, refactoring, code review. Then we switch to deploying that code and write hundreds of lines of YAML, accepting the lack of expressiveness, missing abstractions, and missing flexibility as the cost of doing business. Or worse, we log into the cloud console and click our way through to the deployment.

This article explores an alternative: defining cloud infrastructure in Java, with the same tools and practices we use for application code. We’ll build a working example, a Java service deployed on AWS, covering the full lifecycle from resource definition through testing to CI/CD. While this example uses Quarkus, the infrastructure patterns demonstrated here apply equally for Spring Boot, Jakarta EE, or any other containerized Java framework. The companion code is available at github.com/wlami/stop-writing-yaml-javapro.

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Tue, 28 Apr 2026 12:00:02 +0000

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Download free PDF here: Edition 04/2026 | Java in the Age of AI

04-2026 | Java in the Age of AI - Special Edition

Mon, 27 Apr 2026 12:50:36 +0000

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JCON
▪️A Big Screen Experience for Java Developers & Architects

CORE JAVA
▪️A Big Screen Experience for Java Developers & Architects
▪️Effective Pattern Matching 2026 Edition
▪️Data Oriented Programming with Java
▪️Java 26 adopts HTTP/3 with the Evolution of the HttpClient
▪️Java 26 GC: Making Data Streaming Faster and More Reliable in Containers
▪️1BRC – The First 80%
▪️Building GPU Accelerated LLM Inference Libraries with TornadoVM
▪️Reactor Has Died, Long Live REACTOR!

Don’t Miss: New AI Award & AI Highlights at JCON 2026

Mon, 20 Apr 2026 13:08:00 +0000

JCON EUROPE 2026 is about to kick off – and anticipation is building. The conference opens its doors today in Cologne, once again bringing together the international Java community. Just ahead of the event, new high-profile AI highlights have been announced, making it one of the most important meeting points for AI and Java experts in Europe.

Focus on AI: Highlights on Wednesday

A special focus is placed on AI on Wednesday, April 22. The day begins with a high-level keynote:

Zero Migration Java - Staying Current Without Breaking Your App

Fri, 10 Apr 2026 07:00:01 +0000

Keeping enterprise Java applications secure and up-to-date is critical but traditional runtime upgrades often come with painful migrations, broken dependencies, and retesting cycles. What if developers could upgrade their runtime without touching their code? In this article, we explore the concept of zero migration — a runtime model that allows Java applications to stay current with the latest pat

The Inconvenient Truth About Code, 30 Years of Java & Sovereign AI – The Keynotes of #JCON2026

Fri, 27 Mar 2026 07:00:01 +0000

4 Days | 100+ Speakers | 100+ Sessions | In-Person

JCON EUROPE 2026 is just around the corner and once again brings the international Java community to Cologne. At the Cinedom Cinema, attendees can expect an extensive program with over 100 sessions as well as three central keynotes that will open each conference day.

Three Keynotes at a Glance

Java: 30 Years and Beyond

Tuesday, April 21 | 10:15 AM | Cinema 5
Speaker: Sharat Chander (Senior Director & Head of Global Devleoper Programs, Oracle)

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Thu, 26 Mar 2026 12:05:02 +0000

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‘From Coder To System Designer’ – download free PDF here!

03-2026 | From Coder to System Designer

Thu, 26 Mar 2026 11:50:02 +0000

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JCON
▪️Architect Your Own Experience: Creating Your Individual JCON 2026 Journey

CORE JAVA
▪️The Foundations of Data-Oriented Programming in Java
▪️Lazy Constants in Java 26: Deferred Immutability and JVM Trust
▪️Final Is No Longer a Hint in Java 26
▪️Java 26 in Practice: How the JVM Is Changing the Way We Write Code
▪️Reverse Engineering Java: Backtracking Native Crashes

API & FRAMEWORKS
▪️Paketo Buildpacks: Ready for Java 26 & More!
▪️Stop Writing YAML: How to Define, Test, and Deploy Your Cloud in Pure Java
▪️Beyond REST: Rethinking APIs with GraphQL and Java
▪️Solving Spring AI’s UI Challenge with AG-UI’s Java SDK

More Than Just a Conference for Java Enthusiasts | JCON 2026

Tue, 24 Mar 2026 12:00:02 +0000

With over 100 speakers, more than 100 sessions, and a diverse supporting program, JCON Europe 2026 once again positions itself as one of the leading events for the Java community. Taking place in Cologne as an in-person conference, the event combines deep technical expertise with a strong focus on creating a highly customizable attendee experience.

A Conference Tailored to You

JCON Europe 2026 is designed to give participants full control over their conference journey. A wide variety of session formats, thematic tracks, and networking opportunities allow developers to build a schedule that aligns with their interests, experience level, and career goals.

How JCON Becomes Your Individual Highlight!

Tue, 03 Mar 2026 12:31:42 +0000

After welcoming attendees from 56 countries across six continents at JCON EUROPE 2025, JCON is aiming to surpass last year’s success and reach new heights.

Live Coding Experience on the Big Screen - unique in Germany

Developers want to see code. For this reason, the 11th edition of JCON will once again take place as an in-person conference in a multiplex cinema in Cologne. The event transforms coding and programming into a cinematic spectacle, ensuring that every detail of the incredible speakers is showcased in full detail on the big screen.

Stay Updated with Every New Free PDF Edition!

Mon, 23 Feb 2026 12:20:13 +0000

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Download free PDF here: Edition 02/2026 | Engineering Intelligence - Building Systems in the AI Age

02-2026 | Engineering Intelligence

Mon, 23 Feb 2026 11:07:31 +0000

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JCON
▪️Engineering Intelligence Live: JAVAPRO Benefits for JCON 2026

CORE JAVA
▪️Building Low-Latency Event Pipelines With Java 25
▪️Achieving Microsecond Latencies With Java: Practical Techniques for Building Ultra-Fast Systems

API & FRAMEWORKS
▪️API Development: Implementing POST and SSE Events in Jakarta REST
▪️Open J Proxy: A Modern Open-Source Approach to Database Connectivity for the Java Ecosystem
▪️From Tables to JSON: Handling Unstructured Data in RDBMS Systems With Spring Boot
▪️Java 26 and Spring Boot 4: From Certification Skills to Production-Ready Applications
▪️From Cron to Carbon and Cost-Aware: Modernizing Java Background Jobs
▪️Why Struts 1.3 Still Matters in 2026
▪️The Jakarta Cliff: Why Modern Java Leaves Struts 1 Behind

Free Tickets for JCON EUROPE 2026

Wed, 11 Feb 2026 12:00:00 +0000

4 Days | 100+ Speaker | 100+ Sessions | In-Person

The Ultimate Java Experience on The Big Screen!

JCON EUROPE 2026 is returning to the big cinema screen from April 20–23, 2026! Join JCON for a top-tier Java conference featuring four parallel tracks, hands-on workshops, and a vibrant international Java community.

📅 Monday, April 20th – Big Workshop Day
📅 Main Conference: April 21st- 23rd – Deep-dive sessions, live coding & networking
📅 Premium AI Track: April 21st - 22nd - Special AI-focused track for VIPs & ticket upgrades
📅 VIP Event: April 22nd – Exclusive gathering with Java experts
🍻 Happy Hour: April 21st - 22nd – Unwind and network with fellow developers

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Tue, 03 Feb 2026 11:54:17 +0000

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‘Agentic AI Meets Java’ – download free PDF here!

Houston, we have problems with the queries

Thu, 29 Jan 2026 07:00:02 +0000

introduction

Most developers build queries to access a relational database, using some ORM in different ways to generate the query automatically or write the query manually. Everything could work in most cases in other environments, but at some point, the query becomes slow, or the application takes more time to execute the same task that it did in the past. At this point, the developers, QA, and many others waste a lot of time understanding the change that produced the problem in the last commits, but why not create a test that detects some issues with performance before they appear?

20% Early Bird Ends January 31 — Premium AI Track and 100+ Sessions Await at JCON 2026

Tue, 27 Jan 2026 12:00:02 +0000

With JCON EUROPE 2026 coming up this spring, the discounted Early Bird phase is about to close. The Early Bird ticket offer ends on January 31, 2026 (23:59, Europe/Berlin) — giving attendees roughly one week to secure the reduced rate before regular pricing takes over.

JCON EUROPE 2026 will take place April 20–23, 2026 at Cinedom Cologne, featuring four in-person days of Java content on an unusual but fitting venue: a cinema. Sessions and demos are designed for the big screen, with the program running daily 9:00–18:00 onsite.

Elasticsearch Java SDK: No Magic, Just Solid Design Choices

Tue, 13 Jan 2026 07:00:01 +0000

Java’s API ecosystem is massive, but quality is not granted for free, and not necessarily widespread. Building a good API is not trivial, and focus is required. You need balanced abstractions, keep the threading model sane, and provide developers a satisfying experience.

The Elasticsearch Java SDK caught my attention because it actually gets this stuff right. I dug into the design decisions that make it work, and the overall approach is worth understanding, even if there are trade-offs to consider.

Apache Causeway - GOING FURTHER

Thu, 01 Jan 2026 07:00:01 +0000

In this article we’ll continue our exploration of the Apache Causeway, a Spring Boot framework for domain-driven apps following the naked objects pattern. Our focus this time is the framework’s support for validation, on testing, and we’ll also look at some additional UI hints.

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Tue, 09 Dec 2025 10:37:19 +0000

Have You Enjoyed the Previous Part of Our Special Edition ‘Java 25’?
Now Part 2 is here — and it’s packed with even more expert insights, community voices, and Java highlights from the past 30 years & the Java 25 release.

Untapped Potential in the Java Build Tool Experience

Thu, 23 Oct 2025 07:00:01 +0000

The Java language is known to be fast, safe, and easy, but Java build tools like Maven or Gradle don’t always live up to that reputation. This article will explore what “could be”: where current Java build tools fall short in performance, extensibility, and IDE experience, and the reasons to believe that we can do better. We will end with a demonstration of an experimental build tool “Mill” that makes use of these ideas, proving out the idea that Java build tooling has the potential to be much faster and easier to use than it is today.

JCON EUROPE 2026 - CFP 3 Days left

Wed, 22 Oct 2025 13:24:30 +0000

The Call for Papers for JCON EUROPE 2026 is closing soon, with only three days remaining for submissions. The deadline is Friday, October 24, 2025, at 23:59 (UTC+2).

As the premier in-person Java community conference in Germany, JCON EUROPE will return to the Cinedom in Cologne from April 20–23, 2026, bringing together Java developers, architects, and technology experts from around the world.

The conference is renowned for its distinctive cinema setting, strong community spirit, and high-caliber technical sessions. Attendees can look forward to a packed agenda, a vibrant hallway track, and the popular Mentorship Hub hosted by Bruno Souza, offering direct interaction between newcomers and seasoned industry leaders.

MockServer NeoLight: A Lightweight Alternative for API Testing with Testcontainers

Fri, 17 Oct 2025 07:00:02 +0000

The open-source project MockServer NeoLight has been released as a lightweight rewrite of the original MockServer. Its primary focus lies on simplicity, maintainability, and seamless integration with Testcontainers.

The MockServer concept allows developers to mock HTTP and HTTPS requests in order to simulate APIs for testing purposes. By setting expectations for incoming requests and defining responses, it creates controlled environments for integration testing. This isolates the system under test from real external dependencies, leading to predictable and repeatable results.

Crafting Your Own Railway Display with Java!

Tue, 14 Oct 2025 07:00:01 +0000

Have you fancied to have your own railway display at home? If you love traveling by public transport and always jump on the train just before the door closes like me, it’s really cool and highly efficient to have your own personalized display.

Background

Without live data, this project could not work. Luckily, all the data that was needed, was publicly and freely available with Nederlandse Spoorwegen (NS) APIs. To access them, you only need to create an account in the NS API Portal and subscribe to the APIs you want to use.

Call for Papers for JCON EUROPE 2026 Extended Until October 24

Mon, 13 Oct 2025 17:54:40 +0000

The Call for Papers (CFP) for JCON EUROPE 2026 has been extended by two weeks. The new deadline for submissions is Friday, October 24, 2025 (23:59 UTC+2).

The extension gives potential speakers more time to finalize their proposals for the next edition of Europe’s leading community-driven Java conference. JCON EUROPE will take place April 20–23, 2026, once again at the Cinedom in Cologne – a venue known for its cinema-sized screens and vibrant hallway track atmosphere.

Supercruising with Testcontainers: Making Tests Faster and More Flexible

Fri, 10 Oct 2025 07:00:01 +0000

Testcontainers has become an essential tool in many Java projects to run integration and system tests in realistic environments. However, when test scenarios grow complex, developers often run into limitations—especially around configuration, parallelization, and resource usage. An open-source framework built on top of Testcontainers addresses some of these challenges with powerful extensions.

Testcontainers Infrastructure (TCI) Framework

1. Improve customizability and parallelization

By using the factory pattern when creating containers, the goal is to make it easier for developers to adjust the containers as needed.

Always Up to Date - with Every New Free PDF Edition!

Tue, 30 Sep 2025 12:24:30 +0000

Have You Enjoyed the Previous Parts of Our Special Edition ‘30 Years of Java’?
Now Part 3 2|2 is here — and it’s packed with even more expert insights, community voices, and Java highlights from the past 30 years.

Apache Causeway - An Introduction

Tue, 30 Sep 2025 07:00:01 +0000

In this article we explore key concepts of the Apache Causeway framework, learning how it surfaces domain logic directly in the UI, with minimal boilerplate. You’ll gain a practical understanding of how Causeway supports rapid prototyping and domain-driven development.

JCON EUROPE 2026 - CFP Is Open

Tue, 23 Sep 2025 12:00:02 +0000

The Call for Papers is now open, and we’re looking for all to share your expertise, showcase cutting-edge solutions, and inspire the community. Got an exciting project? A story to tell? Real-world insights? We want to hear from you!

Be a pioneer: Help shape the future of Java! Present your innovative ideas and projects to an international audience on a giant cinema screen.
Increase your visibility: Position yourself as a recognized authority in the Java community and take advantage of the opportunity for personal 1-on1 Sessions.
Expand your network: Make contacts with leading experts from the Java world and keep your finger on the pulse.
Experience an unforgettable atmosphere: JCON is more than just a conference - it is a celebration of the Java community.

Your Topics

Whether you are interested in Core Java, cloud-native development, microservices, artificial intelligence or other exciting areas - JCON offers a stage for all aspects of the Java world.

The Role of Quarkus in the Modern Java Ecosystem

Fri, 22 Aug 2025 07:00:02 +0000

Since its inception in 2019, Quarkus has gradually grown both in user adoption and innovation. The number of its different research and development areas is just enormous. It’s one of the most active Java projects you can find right now.

Last year, Quarkus celebrated its 5th birthday and one additional tremendous milestone — 1000 contributors! These are contributors to the main repository only, not considering the additional 170 repositories under the Quarkiverse organization (which we tackle later in this article).

"Quarkus in the Real World": Richard Fichtner shares insights in the Quarkus Podcast

Mon, 30 Jun 2025 15:12:18 +0000

In Episode #203 of the official Quarkus Insights Podcast, XDEV CEO and Java Champion Richard Fichtner joined hosts Holly Cummins and Max Rydahl Andersen—both core Quarkus developers—for an insightful conversation about using Quarkus in a large-scale real-world education project.

Richard shares details about a groundbreaking initiative: In collaboration with the Educational Data Science department at University of Regensburg, XDEV developed a scalable application to support reading skills in Bavarian elementary schools—commissioned by the Bavarian Ministry of Education.

Java's impact in technology spectrum

Tue, 24 Jun 2025 07:00:01 +0000

Introduction

Java has evolved from a simple programming language to a epitome of modern software development. Its design philosophy and key features shaped its own ecosystem. This also left a lasting impact on many other languages, frameworks, and technologies. Java has played a pivotal role in shaping the development of enterprise applications, web frameworks, mobile technologies, and cloud-based solutions. It continues to evolve and influence these domains for decades. In this blog, we will explore how Java’s key features inspired the world of software development and other programming languages.

Adapting Java for Modern APIs: REST, GraphQL, and Event-Driven Innovation

Thu, 05 Jun 2025 07:00:01 +0000

Introduction

In the rapidly evolving world of software development, new API standards like REST, GraphQL, and event-driven architectures are crucial for building scalable, efficient systems. Java for modern APIs, known for its stability in enterprise applications, has continually adapted to meet the demands of these modern paradigms. With an evolving ecosystem, Java for modern APIs remains a robust choice for developers creating flexible, scalable web services.

This article explores how Java for modern APIs has evolved to support REST, GraphQL, and event-driven architectures, highlighting the technical advancements, key frameworks, and best practices that power modern API development.

Goodbye to ORM Pain: EclipseStore Hands-On with the Lead of the Open-Source Project

Thu, 24 Apr 2025 12:19:17 +0000

Many Java developers are all too familiar with the downsides of traditional ORM frameworks: performance bottlenecks under scale, complex serialization, and recurring issues when refactoring persistent object models. If you’re looking for a modern, high-performance alternative, EclipseStore deserves a closer look – and not just in theory, but in practice.

Experience EclipseStore in Action – Led by a Core Contributor

At this year’s JCON EUROPE 2025, you’ll have a unique opportunity to get hands-on with EclipseStore. Florian Habermann, CTO of MicroStream Software and a core contributor to EclipseStore, is hosting a two-hour practical workshop. Rather than sitting through slides, participants will actively code – in their own IDEs, with Java, and against production-relevant use cases.

High-Demand Workshops at JCON EUROPE 2025 – Tickets Available Now

Thu, 10 Apr 2025 07:00:03 +0000

Cologne – JCON EUROPE returns to its venue from May 12–15, once again offering an extensive program for Java enthusiasts. In addition to over 100 speakers and sessions, Monday, May 12 is fully dedicated to hands-on, expert-led workshops.

Each workshop is a two-hour deep dive into cutting-edge technologies and real-world development topics. Participants can choose from a total of seven different sessions across two time slots: 1:00–3:00 PM and 4:00–6:00 PM. A coffee break in between provides room for informal networking.

JCON EUROPE 2025: Live Coding, Networking & Community-Highlights

Tue, 08 Apr 2025 10:00:01 +0000

4 Days | 100+ Speaker | 100+ Sessions | 9 Workshops | In-Person

JCON EUROPE 2025 returns as one of the leading Java community events in Europe. Last year’s edition welcomed participants from 56 countries across six continents. The 10th edition will not only feature a packed schedule of technical sessions and live coding formats, but will also place a stronger emphasis on personal exchange and community interaction. Several curated networking formats will complement the conference program, offering attendees direct access to speakers, experts, and peers.

JCON EUROPE 2025 - CFP Is Open

Fri, 18 Oct 2024 21:43:36 +0000

Be a pioneer: Help shape the future of Java! Present your innovative ideas and projects to an international audience on a giant cinema screen.
Increase your visibility: Position yourself as a recognized authority in the Java community and take advantage of the opportunity for personal 1-on1 Sessions.
Expand your network: Make contacts with leading experts from the Java world and keep your finger on the pulse.
Experience an unforgettable atmosphere: JCON is more than just a conference - it is a celebration of the Java community.

Your Topics

Whether you are interested in Core Java, cloud-native development, microservices, artificial intelligence or other exciting areas - JCON offers a stage for all aspects of the Java world.

Save The Date - JCON EUROPE 2025

Fri, 18 Oct 2024 19:03:32 +0000

4 Days | 100+ Speakers | 100+ Sessions | daily 9am - 18pm live |

May 19-22 | Join us in Cologne, Germany for 3 days of Java-powered excitement and a workshop day on Monday. We’ll take over our beloved Cinedom the multiplex cinema in Cologne, Germany and end with a massive birthday bash on Thursday, May 22nd to honor Java’s incredible 30-year journey.

Why JCON EUROPE

This isn’t just a conference; it’s the premiere Java community conference in Germany, where Java developers from around the globe come together. Powered by the Java community and organized by the JAVAPRO Magazin in collaboration with Java User Group Oberpfalz, JCON EUROPE is where brilliant minds come together to learn, network, and have a blast. And this year, with 30 years of Java and the 10th edition of JCON to celebrate, it’s going to be the biggest, most unforgettable edition yet.